BR9001823A - APPLIANCE FOR PROTECTION AGAINST EXCESSIVE TENSION OF TELEPHONE LINES - Google Patents
APPLIANCE FOR PROTECTION AGAINST EXCESSIVE TENSION OF TELEPHONE LINESInfo
- Publication number
- BR9001823A BR9001823A BR909001823A BR9001823A BR9001823A BR 9001823 A BR9001823 A BR 9001823A BR 909001823 A BR909001823 A BR 909001823A BR 9001823 A BR9001823 A BR 9001823A BR 9001823 A BR9001823 A BR 9001823A
- Authority
- BR
- Brazil
- Prior art keywords
- voltage
- lines
- signals
- clamping
- voltage signals
- Prior art date
Links
- 230000001052 transient effect Effects 0.000 abstract 2
- 238000001914 filtration Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/18—Automatic or semi-automatic exchanges with means for reducing interference or noise; with means for reducing effects due to line faults with means for protecting lines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Emergency Protection Circuit Devices (AREA)
- Interface Circuits In Exchanges (AREA)
- Devices For Supply Of Signal Current (AREA)
- Control Of Resistance Heating (AREA)
- Protection Of Static Devices (AREA)
Abstract
Overvoltage protection circuits (10 or 50 or 52 or 54 or 56 or 58 or 60 or 62 or 318) are provided for a pair of telephone lines and effective for suppressing noise and transient voltage signals occurring above data and voice signals carried on the telephone lines. The circuits provide common mode signal rejection and avoid current flow between the telephone lines responsive to common mode voltage signals on the lines so that audible hum is avoided. The circuits include first voltage clamping circuitry (11 or 311) for clamping voltage signals on the lines at a first predetermined voltage potential and second voltage clamping and filter circuitry (22 or 50 or 52 or 54 or 56 or 58 or 60 or 62 or 318) for clamping voltage signals on the lines at a second predetermined voltage potential and for filtering noise and transient signals from the voltage signals only when the voltage signals exceed the second predetermined voltage potential. The second voltage clamping circuitry provides common mode signal rejection and substantially avoids current flow between the lines responsive to common mode voltage signals on the lines.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/341,771 US4941063A (en) | 1988-03-04 | 1989-04-20 | Telephone lines overvoltage protection apparatus |
| US41292589A | 1989-09-26 | 1989-09-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BR9001823A true BR9001823A (en) | 1991-06-11 |
Family
ID=26992651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BR909001823A BR9001823A (en) | 1989-04-20 | 1990-04-18 | APPLIANCE FOR PROTECTION AGAINST EXCESSIVE TENSION OF TELEPHONE LINES |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0393333B1 (en) |
| AT (1) | ATE141457T1 (en) |
| AU (1) | AU629603B2 (en) |
| BR (1) | BR9001823A (en) |
| DE (1) | DE69028031T2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU643297B2 (en) * | 1990-06-28 | 1993-11-11 | Telstra Corporation Limited | Electrical coupling device |
| NZ260129A (en) * | 1993-04-08 | 1996-08-27 | Alcatel Australia | Controlling power dissipation in telephone semiconductor line switch |
| DE4402461A1 (en) * | 1994-01-28 | 1995-08-03 | Sel Alcatel Ag | Protection circuit for a subscriber line circuit and subscriber line circuit with it |
| GB2315634A (en) * | 1996-07-18 | 1998-02-04 | Bowthorpe Ind Ltd | Device for protecting a telecommunications apparatus |
| US6298134B1 (en) * | 1999-09-14 | 2001-10-02 | Tyco Electronics Corporation | System for protecting telecommunications equipment from transient voltages |
| US11239654B1 (en) * | 2019-01-19 | 2022-02-01 | Faraday Defense Corporation | Surge protection device for complex transients |
| US11362083B2 (en) | 2020-02-11 | 2022-06-14 | Semtech Corporation | TVS diode circuit with high energy dissipation and linear capacitance |
| US12253552B2 (en) | 2021-10-01 | 2025-03-18 | Faraday Defense Corporation | Apparatus for detection of electrical disturbances resulting from electromagnetic pulse |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3725613A (en) * | 1971-02-25 | 1973-04-03 | Rochester Tel Corp | Apparatus for protecting and testing telephone network |
| US4389695A (en) * | 1981-02-09 | 1983-06-21 | Carpenter Jr Roy B | Equipment for protecting electronic equipment and personnel against inadvertent occurrence of extended or transient high voltages and method |
| CA1231753A (en) * | 1984-04-17 | 1988-01-19 | Northern Telecom Limited | Interactive overvoltage protection device |
| US4729005A (en) * | 1985-04-29 | 1988-03-01 | General Electric Company | Method and apparatus for improved metal-insulator-semiconductor device operation |
| CA1233583A (en) * | 1985-06-18 | 1988-03-01 | Francis Y. Hung | Protection arrangement for a telephone subscriber line interface circuit |
| WO1987006787A1 (en) * | 1986-04-30 | 1987-11-05 | Standard Telephones And Cables Pty. Limited | Telephone protection circuit |
| CA1281768C (en) * | 1986-09-09 | 1991-03-19 | Francis Yun-Tai Hung | Protection arrangements for communications lines |
| US4758920A (en) * | 1987-03-02 | 1988-07-19 | Oneac Corporation | Telephone and data overvoltage protection apparatus |
-
1990
- 1990-01-30 AU AU48913/90A patent/AU629603B2/en not_active Ceased
- 1990-02-28 DE DE69028031T patent/DE69028031T2/en not_active Expired - Fee Related
- 1990-02-28 AT AT90103876T patent/ATE141457T1/en not_active IP Right Cessation
- 1990-02-28 EP EP90103876A patent/EP0393333B1/en not_active Expired - Lifetime
- 1990-04-18 BR BR909001823A patent/BR9001823A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ATE141457T1 (en) | 1996-08-15 |
| AU4891390A (en) | 1990-11-08 |
| EP0393333A3 (en) | 1992-04-01 |
| DE69028031D1 (en) | 1996-09-19 |
| DE69028031T2 (en) | 1997-01-02 |
| EP0393333A2 (en) | 1990-10-24 |
| EP0393333B1 (en) | 1996-08-14 |
| AU629603B2 (en) | 1992-10-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| KD | Notifcation of receipt (letter patent) | ||
| FG | Letter patent granted | ||
| B21A | Patent or certificate of addition expired [chapter 21.1 patent gazette] |
Free format text: PATENTE EXTINTA EM 18/04/2005 |